Document and Entity Information (USD $)	12 Months Ended
	Mar. 31, 2013	Sep. 30, 2012	Jun. 07, 2013 Common units	Jun. 07, 2013 Subordinated units
Entity Registrant Name	NGL Energy Partners LP
Entity Central Index Key	0001504461
Document Type	10-K
Document Period End Date	Mar. 31, 2013
Amendment Flag	false
Current Fiscal Year End Date	--03-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float		$ 504,278,498
Entity Common Stock, Shares Outstanding			49,147,964	5,919,346
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY